基于响应面模型修正的桥梁结构损伤识别方法

摘要

及时、准确地发现桥梁结构的早期损伤,避免桥梁结构的突然破坏或倒塌,无疑具有重要的理论意义和重大的社会经济效益.文章提出基于响应面模型修正技术和单元模态应变能损伤指标的结构损伤识别方法,通过简支梁室内模型试验来检验方法的有效性,进而以下白石大桥为背景,通过数值模拟方法基于响应面模型修正和单元模态应变能指标进行下白石大桥支座损伤识别.结果表明:单元模态应变能损伤指标对开裂损伤和支座损伤具有较好的敏感性,可识别出多损伤位置和损伤程度,具有应用到实际工程结构进行损伤识别的潜力.%If the early damage of bridge structures can be identified timely and accurately, the theoretical significance, the social and economic benefits can be undoubtedly achieved, and the sudden failure or collapse, and other catastrophic accidents may be avoided. In this study, a damage identification method based on the response surface model updating and the element modal strain energy damage index was proposed for bridge structures. The effectiveness of the proposed damage identification method was examined using the model test of the simply supported steel beams. A prestressed continuous rigid frame bridge with large span, named Xiabaishi Bridge, was taken as an engineering case, and different bearing damage conditions were modeled to validate the proposed damage identification method using numerical simulations. It is revealed that the element modal strain energy damage index is very sensitive to the cracking damage and the bearing damage. The locations and levels of multiple cracking damages and bearing damages can be identified using the proposed damage identification method. Hence, the proposed damage identification method has the great potential in the damage identification of practical engineering structures.